CA2465651A1 - Dual antenna coil transponder system - Google Patents

Dual antenna coil transponder system Download PDF

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Publication number
CA2465651A1
CA2465651A1 CA002465651A CA2465651A CA2465651A1 CA 2465651 A1 CA2465651 A1 CA 2465651A1 CA 002465651 A CA002465651 A CA 002465651A CA 2465651 A CA2465651 A CA 2465651A CA 2465651 A1 CA2465651 A1 CA 2465651A1
Authority
CA
Canada
Prior art keywords
antenna
circuit
antennas
communicatively coupled
interrogator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002465651A
Other languages
French (fr)
Other versions
CA2465651C (en
Inventor
William H. Ward, Jr.
Timothy Jon Ward
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Avid Identification Systems Inc
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2465651A1 publication Critical patent/CA2465651A1/en
Application granted granted Critical
Publication of CA2465651C publication Critical patent/CA2465651C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H01Q1/2216—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in interrogator/reader equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/59—Responders; Transponders
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
    • G06K7/10336—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers the antenna being of the near field type, inductive coil
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2468—Antenna in system and the related signal processing
    • G08B13/2477—Antenna or antenna activator circuit
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • General Health & Medical Sciences (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Theoretical Computer Science (AREA)
  • Near-Field Transmission Systems (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

The present invention relates to a dual antenna coil (112, 114) identificati on system, and more particularly, to an interrogator (100) or reader for inductively coupling to a transponder and thereby extract data from the transponder. The magnetic field required to energize a transponder is generated by currents flowing through two essentially identical but opposite phased antenna coils arranged near the area where tags are to be read.</SDOA B>

Claims (9)

1. An interrogator for a radio frequency identification device comprising, an antenna driver circuit;
a first antenna;
a second antenna; and a sputter circuit communicatively coupled to said antenna driver circuit such that said sputter circuit splits a drive current generated by said antenna driver circuit into substantially similar first and second antenna currents directed to said first and second antennas, respectively.
2. An interrogator comprising, an antenna driver circuit;
a sputter circuit communicatively coupled to the antenna driver circuit to receive a drive signal and split the drive signal into balanced drive signals;
a first antenna communicatively coupled to the splitter circuit to receive said first balanced drive signal;
a second antenna communicatively coupled to the sputter circuit to receive said second balanced drive signal; and a receiver communicatively coupled to the first and second antennas to receive and decode a transponder signal obtained by said first and second antennas.
3. A field effect detector/interrogator to detect a variations in an electro magnetic field comprising;
an antenna driver;
a first antenna;
a second antenna; and a sputter circuit communicatively coupled to said antenna driver such that said splitter splits a drive current signal generated by said antenna driver into a substantially similar first and second antenna drive signals directed to said first and second antennas respectively; and a difference current detector communicatively coupled to said splitter to measure any differential currents imposed on the first and second antennas.
4. The interrogator according to an of claims 1 to 3 further comprising a difference current detector communicatively coupled to said splitter to obtain a signal derived from a field differential between the first antenna as compared to the second antenna.
5. The interrogator according to any of claims 1 to 3 wherein the difference current detector is a differential transformer.
6. The interrogator according to any of claims 1 to 3 further comprising a receiver to receive the signal derived from the field differential and a decoder to process the signal to obtain encoded information.
7. The interrogator according to any of claims 1 to 3 where the receiver further includes an auto-nulling circuit to null any offset between current in the first antenna and the second antenna.
8. The interrogator according to any of claims 1 to 3 wherein said sputter further includes an antenna balance circuit to adjust the first and second antennas so that the driving signals to the first and second antennas are substantially equivalent.
9. The interrogator according to any of claims 1 to 3 further comprising an auto-tuning circuitry to tune the drive current provided to the first and second antennas to a desired resonance.
CA2465651A 2001-11-02 2002-11-01 Dual antenna coil transponder system Expired - Lifetime CA2465651C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US33799601P 2001-11-02 2001-11-02
US60/337,996 2001-11-02
PCT/US2002/035167 WO2003040950A2 (en) 2001-11-02 2002-11-01 Dual antenna coil transponder system

Publications (2)

Publication Number Publication Date
CA2465651A1 true CA2465651A1 (en) 2003-05-15
CA2465651C CA2465651C (en) 2011-02-08

Family

ID=23322948

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2465651A Expired - Lifetime CA2465651C (en) 2001-11-02 2002-11-01 Dual antenna coil transponder system

Country Status (14)

Country Link
US (1) US7347379B2 (en)
EP (1) EP1449113B1 (en)
JP (2) JP3914537B2 (en)
KR (1) KR100676474B1 (en)
AT (1) ATE342547T1 (en)
AU (1) AU2002353975B2 (en)
CA (1) CA2465651C (en)
CY (1) CY1106282T1 (en)
DE (1) DE60215382T2 (en)
DK (1) DK1449113T3 (en)
ES (1) ES2272796T3 (en)
HK (1) HK1069448A1 (en)
MX (1) MXPA04004165A (en)
WO (1) WO2003040950A2 (en)

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WO2012058749A1 (en) * 2010-11-02 2012-05-10 Securekey Technologies Inc. Apparatus and method for detecting rfid signals
USD854612S1 (en) 2016-10-28 2019-07-23 Square, Inc. Electronic device
US10430783B2 (en) 2016-10-03 2019-10-01 Square, Inc. Transmit phase detection circuit

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US8472560B2 (en) 2010-11-02 2013-06-25 Securekey Technologies Inc. Apparatus and method for detecting RFID signals
US10430783B2 (en) 2016-10-03 2019-10-01 Square, Inc. Transmit phase detection circuit
USD854612S1 (en) 2016-10-28 2019-07-23 Square, Inc. Electronic device

Also Published As

Publication number Publication date
EP1449113A4 (en) 2005-01-12
US20050087599A1 (en) 2005-04-28
ATE342547T1 (en) 2006-11-15
DE60215382D1 (en) 2006-11-23
JP2007109242A (en) 2007-04-26
DE60215382T2 (en) 2007-08-23
EP1449113A2 (en) 2004-08-25
DK1449113T3 (en) 2007-01-29
AU2002353975B2 (en) 2007-12-06
CA2465651C (en) 2011-02-08
KR100676474B1 (en) 2007-02-02
US7347379B2 (en) 2008-03-25
JP4504342B2 (en) 2010-07-14
KR20040062606A (en) 2004-07-07
WO2003040950A3 (en) 2003-09-18
MXPA04004165A (en) 2004-07-08
CY1106282T1 (en) 2011-10-12
JP3914537B2 (en) 2007-05-16
EP1449113B1 (en) 2006-10-11
WO2003040950A2 (en) 2003-05-15
JP2005508597A (en) 2005-03-31
HK1069448A1 (en) 2005-05-20
ES2272796T3 (en) 2007-05-01

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